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// Copyright 2019 The ANGLE Project Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Implements the Overlay class.
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#include "libANGLE/Overlay.h"
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#include "common/system_utils.h"
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#include "libANGLE/Context.h"
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#include "libANGLE/Overlay_font_autogen.h"
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#include "libANGLE/renderer/GLImplFactory.h"
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#include "libANGLE/renderer/OverlayImpl.h"
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constexpr std::pair<const char *, WidgetId> kWidgetNames[] = {
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{"FPS", WidgetId::FPS},
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{"VulkanLastValidationMessage", WidgetId::VulkanLastValidationMessage},
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{"VulkanValidationMessageCount", WidgetId::VulkanValidationMessageCount},
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{"VulkanCommandGraphSize", WidgetId::VulkanCommandGraphSize},
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{"VulkanSecondaryCommandBufferPoolWaste", WidgetId::VulkanSecondaryCommandBufferPoolWaste},
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OverlayState::OverlayState() : mEnabledWidgetCount(0), mOverlayWidgets{} {}
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OverlayState::~OverlayState() = default;
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Overlay::Overlay(rx::GLImplFactory *factory)
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: mLastPerSecondUpdate(0), mImplementation(factory->createOverlay(mState))
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Overlay::~Overlay() = default;
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angle::Result Overlay::init(const Context *context)
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mLastPerSecondUpdate = angle::GetCurrentTime();
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mState.mOverlayWidgets.begin(), mState.mOverlayWidgets.end(),
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[](const std::unique_ptr<overlay::Widget> &widget) { return widget.get() != nullptr; }));
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enableOverlayWidgetsFromEnvironment();
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return mImplementation->init(context);
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void Overlay::destroy(const gl::Context *context)
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ASSERT(mImplementation);
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mImplementation->onDestroy(context);
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void Overlay::enableOverlayWidgetsFromEnvironment()
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std::istringstream angleOverlayWidgets(angle::GetEnvironmentVar("ANGLE_OVERLAY"));
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std::set<std::string> enabledWidgets;
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while (getline(angleOverlayWidgets, widget, ':'))
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enabledWidgets.insert(widget);
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for (const std::pair<const char *, WidgetId> &widgetName : kWidgetNames)
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if (enabledWidgets.count(widgetName.first) > 0)
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mState.mOverlayWidgets[widgetName.second]->enabled = true;
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++mState.mEnabledWidgetCount;
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void Overlay::onSwap() const
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// Increment FPS counter.
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getPerSecondWidget(WidgetId::FPS)->add(1);
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// Update per second values every second.
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double currentTime = angle::GetCurrentTime();
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double timeDiff = currentTime - mLastPerSecondUpdate;
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for (const std::unique_ptr<overlay::Widget> &widget : mState.mOverlayWidgets)
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if (widget->type == WidgetType::PerSecond)
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overlay::PerSecond *perSecond =
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reinterpret_cast<overlay::PerSecond *>(widget.get());
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perSecond->lastPerSecondCount = static_cast<size_t>(perSecond->count / timeDiff);
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mLastPerSecondUpdate += 1.0;
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DummyOverlay::DummyOverlay(rx::GLImplFactory *implFactory) {}
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DummyOverlay::~DummyOverlay() = default;